SO₂ from burning coal and NOₓ from vehicles form H₂SO₄ and HNO₃ in rain. CO₂ forms weak carbonic acid (normal rain pH ~5.6). Ammonia is basic and neutralizes acidity.
Explanation:
Amorphous solids like glass do not have a sharp melting point; they soften over a range of temperatures. Crystalline solids have sharp melting points and long-range order. Glass is an insulator.
Explanation:
A homogeneous mixture has uniform composition throughout. Salt completely dissolves in water, forming a single phase (solution). Oil and water are immiscible (heterogeneous). Sand in water is suspension (heterogeneous). Iron filings and sulfur can be heterogeneous unless alloyed.
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